xxxkat: yes, I have been using one for some time.
They work great.
I have used them in both a Speed Merchant & BK.

Torque 4.8/6.0v : 61 / 76 oz. 4.4 / 5.5 kg.
Speed 4.8/6.0v : 0.15 / 0.12 second
Size : 1.3"x 0.7"x 1.2" 32 x 17 x 31mm
Weight : 1.12 oz 32 g.